feat: complete repo explainer agent with eval harness and optimizer#1
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What this PR delivers
A complete agentic AI system built on the Claude Agent SDK that reads
any codebase and answers natural language questions about it.
Three pillars
🤖 Agent — Multi-step agentic loop with 5 filesystem tools. Reads
files, searches code, maps dependencies, synthesizes grounded answers.
Supports both local paths and GitHub URLs transparently.
📊 Eval Harness — 8 test cases with 4 weighted metrics (topic
coverage, hallucination penalty, answer length, groundedness).
Saves full JSON reports per run.
⚡ Optimizer — Automated prompt tuning loop. Runs evals, identifies
failures, asks Claude to improve the system prompt, keeps improvements
and reverts regressions.
Results
Infrastructure
dev